Design an App Mockup

We are currently involved in a project to build a software application - front end will be a web client, back end will be azure services. This is an enterprise application, not a consumer web app.. so if you have experience on the enterprise side this will be advantageous. The app is relatively simple, consisting of around 15 screens with a simple tree style navigation - unless you come up with something better of course! We've included an image of the mock-up for the most complicated screen - this is the only screen that requires any sort of graphics - here the user can move each of these items about and edit the links between them etc. But this is as complex as it will get, the other screens are text and buttons only. You'll see on the left hand side of the screen the navigation tree, which contains the 6 primary areas of user interaction. We also need a logo for the app - you can see the space for this in the top left! We would like to get from our mock-ups, we have the complete app mocked up in the style shown attached, to a set of design files we can share with our web developers in the next few weeks. Once we've talked you through our mock-ups, explained the workings of the app and explained the kind of user experience we require, it is envisaged that we have a fairly small number of quick iterations, followed by the bulk of the work, followed by a final resolution iteration of any minor, remaining fixes.